Hairbrush



FIG. 1 is a side elevational view of a hairbrush showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an end elevational view as seen from the left of FIG. 1; and

FIG. 5 is an elevational view of the opposite end thereof.

The undisclosed side elevation is the same in appearance as the side shown. 

The ornamental design for a hairbrush, as shown and described. 